Seno Darmanto
Program Diploma III Teknik Mesin Fakultas Teknik Universitas Diponegoro

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PENINGKATAN KEKUATAN SERAT SERABUT KELAPA DENGAN PERLAKUAN SILANE Darmanto, Seno
T R A K SI Vol 11, No 1 (2011): mechanical engineering
Publisher : T R A K SI

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Abstract

Research is done to analyze treatment (physical and chemical) inincreasing quality of coir fiber. Sequential of coir fiber research is done withdetermining characteristic of physically coir fiber, methd of making single fiber, treatment technical and testing of strength. Determining of physically coir fiber characteristic is done by observing and measuring dimension directly and tesling water content. Then making of single fiber is done by selecting of coir fiber, washing, dryrng and brushing/shaving, Treatment of physically coir fiber is begun from coir fiber in outer shell of coconut to single fiber. Kind of physically treatment consists of washing, soaking, natural drytng and supervised drying. Iilashing and soahng use water. Nalural drying of ccir fiber is done wheit coir fiber is outer shell of coconut. Supervised drying is done with hot air in +45C of tempemture. The next, washing, soaking and supervised drying is done to preryrecoir fiber that will be used to chemical treatment. Chemical treqtment is done with silane method. Silane treatment for single coirfiber is done with using silane agent solution. The silane solution is arranged with concentration variation 1%, 2%, 3%, 494up to l0%. Silane treatment uses methanol as solvent. Testing of single coir fiber is done accordingwith refer JIS number R7601 for single fiber. And testing of tensile shows that silane treatrnent will trend to increase strength. The increasing of coir strength andwill be optimum in concentration 7%o of silane agent.Key word: coirfiber, silane treatment, strength
ANALISA BIODIESEL MINYAK KELAPA SEBAGAI BAHAN BAKAR ALTERNATIF MINYAK DIESEL Darmanto, Seno; Sigit A, Ireng
T R A K SI Vol 4, No 2 (2006): mechanical engineering
Publisher : T R A K SI

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Abstract

Research is done to analyze biodiesel of coconut oil as fuel of diesel engine. The analyzing is focused on properties potential of biodiesel of coconut oil as fuel of diesel engine. The research is done in laboratory with making biodiesel of coconut oil and testing properties of biodiesel. The testing of biodiesel consists of B5, B10, B15, B20, B25 and pure biodiesel of coconut oil. Based on analyzing data, it shows that biodiesel has flash point lower than diesel fuel. Biodiesel also has kinematics viscosity higher than diesel fuel. And specific gravity of biodiesel is higher than specific gravity of diesel fuel. Key word: coconut oil, biodiesel, properties, viscosity, flash point, specific gravity, heat value, cetane number
ANALISA UNJUK KERJA BIODIESEL KAPUK RANDU Darmanto, Seno
T R A K SI Vol 10, No 2 (2010): mechanical engineering
Publisher : T R A K SI

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Abstract

This research is carried out to analyze the production of ceiba petandra biodiesel and performance examination in diesel engine. Production of ceiba petandra biodiesel is carried out with transesterification method and alkali catalyst. Transesterification reaction uses methanol and NaOH catalyst. The performance examination is carried out with engine test bed. Engine test bed consists of diesel engine, generator, load and instrumentation. Production of ceiba petandra biodiesel by transesterification method shows the conversion of ceiba petandra biodiesel reaches 90% in condition 50oC – 55oC and material composition consist of 80% of ceiba petandra oil, 20% of methanol and 2 gram NaOH per 100 ml methanol. The performance examination in engine test bed with biodiesel of ceiba petandra shows efficiency reach about 20% to mixture of biodiesel B5 and B10. Key word: ceiba petandra, transesterification, biodiesel and efficiency.
PELUANG PENGHEMATAN ENERGI UAP MENGGUNAKAN METODE NON - INVESTMENT POINT Rahmat, -; Setyoko, Bambang; Darmanto, Seno
T R A K SI Vol 5, No 1 (2007): mechanical engineering
Publisher : T R A K SI

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Abstract

Energy efficiency  of boiler system is the main parameter in depressing of  operational cost. There are two methods to improving efficiency of boiler system. The one is Non-Investment Point method, where not need adding expense to improving energy process by installing of the new equipment in the system ,nevertheless it is significan mean .  From perceiving experience-data sources, about 10 % - 20 % losses can be saved by non-investment point method. Key Word : Boiler, Efficiency, Non-Investment Methode  
APLIKASI TUNGKU TAK PERMANEN UNTUK PENGERINGAN BLOK BATA MENTAH Sediono, Windu; Darmanto, Seno
Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Vol 1, No 1 (2012): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 3 2012
Publisher : Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik

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Abstract

Penelitian tungku model tak permanen dilakukan untuk menganalisa peningkatan fungsi sebagai media pembakaran dan pengeringan. Perancangan model tungku tak permanen dilakukan di laboratorium dan pengujian model tungku dilakukan di industri bata merah kecamatan Jogonalan kabupaten Klaten Jawa Tengah. Tahapan penelitian terdiri dari persiapan blok bata, pengeringan awal bata, pembuatan bata yang akan dibakar, pembuatan tungku, pembakaran dan pembongkaran tungku. Dan berdasarkan hasil uji pembakaran bata merah menunjukkan bahwa dinding tungku tak permanen akan maksimal dengan pola 2/2 di mana pola tersebut menghasilkan lebih dari 9000 blok bata kering untuk ukuran tungku 8 m x 6 m dan ketinggian 20x (kali) tinggi blok bata.Key word: bata merah, tak permanen, pola, tungku, pembakaran, pengeringan
APLIKASI KOLEKTOR MATAHARI MODEL PLAT DATAR UNTUK PROSES PENGERINGAN Darmanto, Seno; Senen, .
Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Vol 1, No 1 (2012): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 3 2012
Publisher : Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik

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Abstract

Penelitian plat datar sebagai pengumpul kalor matahari dilakukan untuk menganalisa tingkat efektifitas penyerapan kalor dan aplikasinya untuk proses pengeringan. Tingkat efektifitas didasarkan pada bahan dan ukuran plat datar, pengaturan posisi, bahan yang dikeringakan, temperatur dan efisiensi. Perancangan alat pengeringan dengan kolektor matahari dilakukan di laboratorium dan pengujian unjuk kerja dilakukan dengan mengeringan salah satu produk makanan pada waktu siang hari dengan waktu efektif 5 jam. Dan berdasarkan hasil uji unjuk kerja prototipe plat pengumpul kalor dengan ukuran 2 mx 1,2 m x 3 mm menunjukkan bahwa temperatur di ruang kolektor dapat mencapai ±50oC.Key word: plat datar, pengumpul, kalor, temperatur, efisiensi, pengeringan
PENINGKATAN KUALITAS PENGERINGAN IKAN DENGAN SISTEM TRAY DRYING Setyoko, Bambang; Darmanto, Seno; Rahmat, .
Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Vol 1, No 1 (2012): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 3 2012
Publisher : Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik

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Abstract

Pada musim panen ikan, nelayan mendapatkan ikan teri dengan jumlah yang sangat besar. Karena sangat banyak, ikan tidak dapat terjual habis. Hal ini mengakibatkan ikan membusuk jika tidak disimpan di tempat pengawetan atau cool storage. Salah satu cara yang digunakan nelayan untuk mengawetkan ikan adalah dengan mengeringkan ikan teri secara alami dengan dijemur di bawah sinar matahari. Proses pengeringan demikian mempunyai banyak kelemahan antara lain membutuhkan waktu lama, memerlukan tempat luas, kualitas ikan menurun karena debu, lalat dan gangguan binatang. Untuk meningkatkan kualitas produk ikan kering maka diperlukan alat pengering tepat guna yang dapat meminimalisir kendala di atas. Pengeringan adalah pengeluaran air bahan hingga mencapai kandungan air tertentu agar kecepatan kerus bahan dapat diperlambat. Proses ini dipengaruhi oleh suhu, kelembaban udara, kecepatan aliran udara, kandungan air yang diinginkan, energi dan kapasitas pengeringan. Alat pengering yang digunakan menerapkan sistem tray drying (pengering tipe rak) konveksi paksa, dimana sirkulasi udara panas dan uap air ikan dibantu blower. Produk diletakkan pada rak yang tersusun agar dapat dikeringkan dengan sempurna. Sumber panas pengeringan dihasilkan dari tungku berbahan bakar batu bara. Sirkulasi udara panas melalui 4 lintas dan pembuangan uap air dilakukan secara paksa dengan exhaust fan yang diatur pada kecepatan 0, 0,8, 1,4 dan 2,8 m/s. Waktu pengeringan tercepat yang dapat dicapai adalah 2 jam 45 menit dengan kecepatan fan 2,8 m/s, kadar air akhir 19,57 %, batu bara 1,95 kg, kapasitas 5 kg, efisiensi kalor 59,7 % dan temperatur rata-rata ruang pengering 85o C. Pengeringan tanpa fan dengan kapasitas 5 kg membutuhkan waktu 6 jam, kadar air 21,42 %, effisiensi thermal 39,8 % dan batu bara 3,05 kg. Pengeringan dengan kecepatan fan 2,8 m/s, kapasitas 25 kg membutuhkan waktu 12 jam, kadar air 18,46 %, effisiensi thermal 63,16 % dan batu bara 6,3 kg. Produk ikan teri kering yang dihasilkan bersih, berwarna coklat muda cerah, renyah, gurih dan tidak berbau asap. Bahkan produk ikan teri kering ini bisa dikonsumsi secara langsung karena sudah matang dan higienis.Kata kunci : tray drying, pengering ikan teri.
KAJIAN PELEPAH KELAPA SEBAGAI SERAT KOMPOSIT (STUDY OF COCONUT BRANCH AS COMPOSITE FIBER) Darmanto, Seno; Sediono, Windu; Setyoko, Bambang; Murni, Murni
TEKNIK Volume 28, Nomor 1, Tahun 2007
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Research is done to analyze coconut branch fiber as car body composite. Analyzing is based onmaterial, composition, and strength of material. Research was done in laboratory. Coconut branchfiber is obtained by natural drying process and cutting to become fiber with ±0,5 mm of length.Reinforcement and binder is determined polyester resin. Coir (coconut fiber) have 1.15 kg/m3 ofdensity, 1.15 MPa of strength dan modulus elastisitas 4 – 6 GPa. And based on specimen and studyof literatures can show that increase of cellulose of natural fiber will increase modulus of elasticity.The Increasing of modulus of elasticity will be maximal with cellulose more than 60%. Color ofspecimen is transparent yellow.
MENGANALISA UNJUK KERJA PENGERINGAN IKAN TERI DENGAN SISTEM SIRKULASI UDARA PAKSA Darmanto, Seno; Setyoko, Bambang
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Experiment is done to know the performance of “teri/stolephorus” fish drying with forced air flow system. Theperformance of fish drying is based on moisture of fish, fan/fan velocity, operation temperature and time. Theresearch is done at laboratory by using drying machine with forced air flow system. Based on data analysis itshows that the moisture of fish achieves 20% on fan velocity maximum 2,8 m/s and times operation 3 hours
PENINGKATAN KUALITAS SERAT DAUN PELEPAH KELAPA MELALUI PERLAKUAN ALKALI Darmanto, Seno; Umardani, Yusuf
ROTASI Volume 11, Nomor 4, Oktober 2009
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (142.433 KB) | DOI: 10.14710/rotasi.11.4.21-25

Abstract

Research is done to analyze treatment (physical and chemical) in increasing quality of coconut leaves fiber. Plot of coconut leaves fiber research is done with determining characteristic of physically coconut leaves, method of making single fiber, treatment technical and testing of strength. Determining of physically coconut leaves characteristic is done by observing and measuring dimension directly and testing water content. Then making of single fiber is done by selecting of coconut leaves, washing, drying and brushing/shaving. Treatment of physically coconut leaves is begun from coconut leaves in sheet shape to single fiber shape. Kind of physically treatment consists of washing, soaking, natural drying and supervised drying. Washing and soaking use water. Natural drying of coconut leaves is done when coconut leaves is sheet. Supervised drying is done with hot air in ±45oC of temperature. Generation of hot air is done with heat transfer from hot water ±60oC of temperature to air in drying pan. The next, washing, soaking and supervised drying is done to prepare coconut leaves that will be used to chemical treatment. Chemical treatment is done with methode alkali. Alkali treatment to single coconut leaves fiber is done with using NaOH solution. The alkali solution is arranged with concentration variation 5%, 10% and 15%. Alkali treatment uses water as solvent. Testing of single coconut leaves fiber is done to refer JIS number R7601 for single fiber. Observing and measuring shows that coconut leave stem has ±230 of coconut leaves. Measuring dimension shows that coconut leaves width have ±1 cm in coconut leaves tip, ±4 cm in coconut leaves center and ±2 cm in coconut leaves stem tip. Water content of coconut leaves can reach ± 50%. Method of making single fiber show that brushing or shaving will be effective when coconut leave is rather dry. Then testing of tensile shows that alkali treatment is trend to increase strength and elongation. The increasing of coconut leaves quality (strength and elongation) will be optimum in concentration 10% of NaOH.